close all
v=[1 1];
u=v/norm(v);
o=[0 0];

ceuArrow(o,v,'b',2)
ceuArrow(o,u,'r',2)
text(v(1)+0.1,v(2)+0.1,'v','FontSize',14)
text(u(1)+0.1,u(2)-0.05,'u_v','FontSize',14)
axis([-1.5 1.5 -1.5 1.5])
axis square
grid on
xlabel('x_1')
ylabel('x_2')

theta=0:1e-3:2*pi;
plot(cos(theta),sin(theta),'k','LineWidth',2);

